<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="./jq-3.6.0.js"></script>
</head>

<body>
    <button>点一下</button>
    <button>点一下</button>
    <button>点一下</button>
    <button>点一下</button>
    <button>点一下</button>
</body>
<script>
    $('button').click(function() {
        alert(1)
    })
</script>

</html>